Rebooted.
Selected Non-Graphical Boot.
Waiting 30 seconds for device /dev/disk/by-label/ANTERGOS …
ERROR: ‘/dev/disk/by-label/ANTERGOS’ device did not show up after 30 seconds…
Falling back to interactive prompt
You can try to fix the problem manually, log out when you are finished
sh: can’t access tty: job conrol turned off
[rootfs ]#

I’m very newbie, but Antergos use UUID to mount partitions and not just /dev/disk (sdaX/hdaX, etc), that’s why it take so long.
It’s not quite clear to me, after adding nomodeset and waiting 30 seconds the livecd finally boot?
If yes, you can use gparted and proceed with installation. After installation if you still have to wait this time you can edit fstab adding the correct UUID for the partitions you create.